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33
Step 10 — Install Economizer Hoods (Units
with Optional High-Capacity Power
Exhaust) —
The economizer uses a total of 4 outdoor
intake hoods, 2 on each side of the unit. See Fig. 36. Two small
hoods (one per side) are factory-installed and are pivoted
inside the unit chassis for shipment. Two large hoods are
shipped in packages located inside the unit. The large hoods
(one on each side) require field assembly and mounting.
INSTALL SMALL HOODS — To install the small econo-
mizer hoods, perform the following procedure:
1. Remove the 10 screws holding each of the small econo-
mizer hood shipping covers in place.
2. Pivot hoods outward. (There are a total of 2 hoods.)
3. Apply seal strip to vertical flange of hood sides.
4. Install 15 screws (4 each side, 7 across top) around the
outside of each hood. Screws are in the fastener package
taped to the basepan inside the fan section.
5. Apply a bead of RTV or similar sealant to corner of econ-
omizer hood at pivot points to prevent water leaks. (See
Fig. 29.)
INSTALL LARGE HOODS — Large hoods are shipped dis-
assembled in the economizer section of the unit behind the
large economizer hood shipping cover. See Fig. 37 for assem-
bly details for large economizer hoods. To install the large
economizer hoods, perform the following procedure:
1. Remove the 17 screws holding each of the large econo-
mizer hood shipping covers in place.
2. Remove the packages containing the disassembled large
economizer hoods (total of 2 packages). Each package
contains the following (see Fig. 37 for Item numbers): left
hood side (Item 1), right hood side (Item 2), hood top
(Item 3), hood front (Item 4), top filter flange (Item 5), 4
side filter flanges (Item 6), bottom support (Item 7), front
support (Item 8), 6 filters (Item 9), 9 filter clips (Item 10),
seal strip, and fasteners.
3. Place seal strip on backside of bottom support (Item 7)
along entire length of support, covering 6 clearance holes.
4. Attach bottom support piece (Item 7) to unit. Be sure seal
strip is between bottom support and panel on unit.
5. Place seal strip on
3
/
4
-in. flange on both the left and right
hood sides (Items 1 and 2).
6. Attach the side filter flanges (Item 6) to the left and right
hood sides (Items 1 and 2), 2 on each hood side.
7. Attach left and right hood sides (Items 1 and 2) to unit. Be
sure seal strip is between hood side and unit.
8. Place seal strip on
3
/
4
-in. flange on hood top (Item 3).
9. Attach top filter flange (Item 5) to hood top (Item 3).
10. Attach top hood to unit and to hood sides. Be sure seal
strip is between hood top and unit.
11. Attach front support (Item 8) between left and right hood
sides.
12. Place seal strip on all filter flanges.
13. Attach filter clips (Item 10) to front and bottom supports
(Items 7 and 8).
14. Install filters (Item 9). Filters are held in place with filter
clips.
15. Attach hood front (Item 4) to hood top and sides.
16. Apply RTV or similar sealant to 6 places shown in
Fig. 37.
OUTDOOR
AIR HOODS
(FIXED)
Fig. 32 — 25% Outdoor-Air Hood Location
END HOODS
(FIXED)
SIDE HOODS
(ROTATE
OPEN)
SIDE HOODS
(ROTATE OPEN)
Fig. 33 — Economizer Outdoor-Air Hood
Installation (Sizes 055-100)
END HOODS
(FIXED)
SIDE HOODS
(ROTATE
OPEN)
POWER
EXHAUST (FIXED)
SIDE HOODS
(ROTATE OPEN)
Fig. 34 — Economizer with Power Exhaust
Outdoor-Air Hood Installation (Sizes 055-100)
END HOODS
(FIXED)
SIDE HOODS
(ROTATE
OPEN)
RETURN/
EXHAUST (FIXED)
SIDE HOODS
(ROTATE OPEN)
Fig. 35 — Economizer with Return
Fan Outdoor-Air Hood Installation
(Units with Optional Return Fan)